你的主要错误是这两行顺序错误：window.exitonclick() #click the screen to close it

draw_square()

exitonclick()，或mainloop()，或done()应该是最灵活的，针对上述和样式问题，你的代码需要重新编写：import turtle

# to draw a square, or eventually a turtle, you need to do the things below

def draw_square():

""" draw square for turtles """

# to draw a square you want to : move forward, turn right,

# move forward, turn right,move forward turn right

brad = turtle.Turtle()

brad.forward(100) # forward takes a number which is the distance to move

brad.right(90) # turn right

brad.forward(100)

brad.right(90)

brad.forward(100)

brad.right(90)

brad.forward(100)

brad.right(90)

window = turtle.Screen()

# this is the background where the turtle will move

window.bgcolor("red") # the color of the window

draw_square()

window.exitonclick() # click the screen to close it